/* funds2.c -- 传递指向结构的指针 */
#include <stdio.h>
#define FUNDLEN 50

struct funds {
    char bank[FUNDLEN];
    double bankfund;
    char save[FUNDLEN];
    double savefund;
};

double sum(const struct funds *); /* 参数是一个指针 */

int main(void) {
    struct funds stan = {"Garlic-Melon Bank", 4032.27,
                         "Lucky's Savings and Loan", 8543.94};

    printf("Stan has a total of $%.2f.\n", sum(&stan));

    return 0;
}

double sum(const struct funds *money) {
    return (money->bankfund + money->savefund);
}